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[1/3] tests/qtest/npcm7xx_rng-test: count runs properly

Message ID 20201103011457.2959989-2-hskinnemoen@google.com (mailing list archive)
State New, archived
Headers show
Series tests/qtest: npcm7xx test fixes | expand

Commit Message

Havard Skinnemoen Nov. 3, 2020, 1:14 a.m. UTC 
The number of runs is equal to the number of 0-1 and 1-0 transitions,
plus one. Currently, it's counting the number of times these transitions
do _not_ happen, plus one.

Source:
https://nvlpubs.nist.gov/nistpubs/Legacy/SP/nistspecialpublication800-22r1a.pdf
section 2.3.4 point (3).

Signed-off-by: Havard Skinnemoen <hskinnemoen@google.com>
---
 tests/qtest/npcm7xx_rng-test.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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Patch

diff --git a/tests/qtest/npcm7xx_rng-test.c b/tests/qtest/npcm7xx_rng-test.c
index da6e639bf6..57787c5ffc 100644
--- a/tests/qtest/npcm7xx_rng-test.c
+++ b/tests/qtest/npcm7xx_rng-test.c
@@ -126,7 +126,7 @@  static double calc_runs_p(const unsigned long *buf, unsigned int nr_bits)
     pi = (double)nr_ones / nr_bits;
 
     for (k = 0; k < nr_bits - 1; k++) {
-        vn_obs += !(test_bit(k, buf) ^ test_bit(k + 1, buf));
+        vn_obs += (test_bit(k, buf) ^ test_bit(k + 1, buf));
     }
     vn_obs += 1;